ἀποσταυροῦν

From LSJ

συνετῶν μὲν ἀνδρῶν, πρὶν γενέσθαι τὰ δυσχερῆ, προνοῆσαι ὅπως μὴ γένηται· ἀνδρείων δέ, γενόμενα εὖ θέσθαι → it is the part of prudent men, before difficulties arise, to provide against their arising; and of courageous men to deal with them when they have arisen

Source

Greek > English (Woodhouse Verbs Reversed)

(see also: ἀποσταυρόω) fortify with a stockade, surround with a palisade

Lexicon Thucydideum

vallo claudere, to close off with a rampart, 4.69.2, 6.101.2, 7.80.6.